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  <script>

    console.log('10 / 5=', 10 / 5); // 2
    console.log("'10' / 5=", '10' / 5); // 2，'10'隐式转换为10

    console.log('10 + 5=', 10 + 5); // 15
    console.log('"10" + 5=', "10" + 5); // "105"


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